Improvement in microscopes



J; J. BAUSGH. Microscope.

No. i99,0l5. Patented Jan. 8,1878.

WZhwaaea: fizrnZor: @144 N. PETERS,PHOTGLITNGGRAPHER, WASHINGTON. D O,

UNITED STATES PATENT OFFICE.

JOHN J. BAUSOH, OF ROCHESTER, ASSIGNOR TO THE BAUSOH & LOMB OPTICAL COMPANY, OF SAME PLACE, AND THE ORANGE J U'DD COMPANY,

on NEW YORK, N. Y.

IMPROVEMENT IN MICROSGOPES.

Specification forming part of Letters Patent No. 199,016, dated January 8, 1878; application filed December 17, 1877.

To all whom it may concern:

Be it known that I, JOHN J. BAUSGH, of Rochester, in the county of Monroe and State of New York, have invented a new and Improved Microscope; and that the following is a full, clear, and exact description of the same, a reference being had to the accompanying drawings, and to the letters of reference marked thereon, making part of this specification.

This invention is in the nature of an improvement in microscopes and the invention consists in amicroscope with a convex base, with. a slot therein for the admission of light beneath the stage, the base having fixed to it clips to retain the slide in position, and also a standard, whereon are placed adjustable lenses.

In the accompanying sheet of drawings,

Figure l is a side view of my microscope,

partly in section; and Fig. 2, a horizontal section of same in line w m, Fig. 1.

Similar letters of reference indicate like parts in both figures.

The microscope to which this invention more particularly applies is a pocket-microscope, to be used, eitherin the hand or onatable, with transmitted or reflected light. The base A of my microscope is made of vulcanite or other suitable material, and is of convex ing through a lug, c, on the frames of the lenses, in such a manner as will permit the lenses to slide and be adjusted vertically to the proper focal distance from the stage or object placed thereon for inspection. Besides the stage 12, the microscope is provided with a glass slide, d, and diaphragm e and cover f, for supporting and retaining objects.

Myinvention,constructed as above described,

is operated by placing an object on the stage I), and by sliding the lenses D on the standard C until a clearly-defined view of the object on the stage is obtained. The magnifying-power used may be varied by using one or more of the lenses D at a time. ject is opaque, nothing further isrcquired, but, if the object is transparent, and to be viewed by means of transmitted light, then the instrument (while held in the hand or placed on a table) is turned so as to bring the slot or opening B toward the light, as from a window, when the light will be transmitted through the stage 12, and through the object placed thereon. This effect will be heightened by placing the instrument on a sheet of white paper, to reflect the light after it has entered the opening B.

When it is desired to observe a live insect, or an object that would be disturbed by the air or the breath of the observer, or a fluid that would quickly evaporate if exposed to the air, the glass slide displaced on the stage b. A Water-proof diaphragm, c, with a circular opening, t, therein, is placed on the slide. The object to beviewed is then placed on the slide, andwithin theopeningc'. Aglasscover, f, then being placed on the diaphragm e, the object is imprisoned in the cell, which is nowformed by the slide (1, diaphragm e, and-cover f, so that it cannot escape, the several parts form ing the cell being held in position by the spring-clips q q, beneath which they are placed. These clips may also be used for holding objects when the cell is not in use.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-- A microscope with a convex base having a glass stage fixed within a central opening therein, and with an opening in its side for the admission of light beneath the stage, substantially as and for the purposes described.

In testimony whereof I hereunto set my hand.

JOHN J. BAUSOH. Witnesses:

JOSEPH E. LUDLAM, WM. GRAEBE.

If the ob- 

